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The car won't start when warm

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Maz33, Jul 13, 2019.

  1. Maz33

    Maz33 Member

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    Your Mercedes:
    CLK 220 cdi
    Hi everyone
    Why is it a CLK 220 Cdi 2006 will not starts when the engine is warm above 60 especially above 80, it just clicks when key is at position two.
    HELP, HELP, please.
     
    Last edited: Jul 13, 2019
  2. Wearsafoxhat

    Wearsafoxhat Senior Member

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    Your Mercedes:
    05 E55k Est, 99 SL500, A200
    Possibly the CPS. (Crank position Sensor)


    Sent from my iPad using Tapatalk
     
    M80 likes this.
  3. Blobcat

    Blobcat Moderator

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    Hello and welcome

    My thoughts as well
     
  4. OP
    Maz33

    Maz33 Member

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    Your Mercedes:
    CLK 220 cdi
    Thank you very much for the reply.
    The CPS is possibility, but when the engine is warm, after pouring cold water over and along the egr cooler the engine starts without any problems.
     
    Last edited: Jul 14, 2019
  5. OP
    Maz33

    Maz33 Member

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    CLK 220 cdi
    Hi everyone
    Furthermore to the engine clicking instead of starting whilst engine is warm/hot. Past a few days that the weather has been hot, I can't start the car, it just clicks. Not been able to use the car at all, help help help please....
    Any suggestion to this new problem?
    Glory and joy of having a merc.
     
  6. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    It's not the CPS. A failed CPS the engine spins over but won't fire.
     
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  7. OP
    Maz33

    Maz33 Member

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    Your Mercedes:
    CLK 220 cdi
    Thank you for the reply, the merc dealer have reprogrammed the ECU, in this condition it was blow up fuse no. 57 (20 amp one of the starter fuse), the starter relay was changed with no effects. An indication of was is wrong will be greatly appreciated.
    When a cold engine does not start in hot weather, this is unique never ever heard of it. Please help
    Thank you in advance.
     
  8. Wighty

    Wighty Senior Member

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    W211/E320cdi/2009 and CLK200k 2009
    Are you saying it is now fixed by MB ? Could they not explain what occurred ?
     
  9. OP
    Maz33

    Maz33 Member

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    CLK 220 cdi
    Hi again thanks for the replay
    Far from it, the MB dealer charge me a large amount and said it is fixed, when I told them the problem is not solved yet, they asked for more money (open cheque) to investigate, it seems the task carried out by MB does not carry grantee.
    The car still will not start (just clicks) when the engine is warm/hot. In the past few days that weather has been, the engine will not start even though the engine is cold, at turn of key to position 2 to start, just a click noise comes from engine compartment. A help and ideas will be greatly appreciated .
     
    Last edited: Jul 26, 2019
    Wighty likes this.
  10. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
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    If you get a click it could be:
    Bad starter
    Bad starter solenoid
    Bad earth
    Bad starter relay (if yours has one).

    If the click is from lower left (passenger) side it's the first three. If the click is from the fusebox area it's the last two.
     
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  11. OP
    Maz33

    Maz33 Member

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    Your Mercedes:
    CLK 220 cdi
    Thanks for replying to my problem,
    The starter motor has been checked no problem and a mechanic checked the earth and found no problem either. The starter relay has been replaced without having any effect. Even egr valve was replaced with new one it had no effect, so the old one cleaned and put back in. In normal condition the car starts without any problems.
    How does one check the starter solenoid?
    Currently the car is unusable so any further ideas will be greatly appreciated
     
  12. umblecumbuz

    umblecumbuz Senior Member

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    If you hear a click under the bonnet when you try with the key to start your car, then the starter solenoid is being energised. If it was duff, or if its trigger wire was faulty, there would be no click.

    The cause might be the starter motor itself, or possibly - no matter what your Merc Dealer said - the starter circuit. This could be either the live feed to the starter or the earth between car body and engine. The blown 20amp fuse points this way.
     
  13. LostKiwi

    LostKiwi Senior Member

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    The click could be the starter relay. This is why I asked him to identify where the click is coming from.
    Agreed about the fuse.
     
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  14. umblecumbuz

    umblecumbuz Senior Member

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    Two people needed. One to turn the key, while the other puts his hand on the starter solenoid. Definite ID then.
     
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  15. LostKiwi

    LostKiwi Senior Member

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    Definitely the best way.
     
  16. OP
    Maz33

    Maz33 Member

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    Thank you very much guys for your inputs.
    I will keep you posted if any new development.
    Meanwhile, I will be grateful for further ideas.
     
  17. LostKiwi

    LostKiwi Senior Member

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    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    It's not even cranking....
     
  18. bembo449

    bembo449 Senior Member

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    sorted ;) , reckon it will be the solenoid in the end even though the OP says his tech has checked it out . . . .
     
  19. davidsl500

    davidsl500 Senior Member

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    Originally it would crank and start when cold but not when hot. Now it won't crank when hot or cold so the problem has got worse. I would have guessed a failing electrical connection - dry joint / break in a wire / cracked PCB which was OK cold but when hot the expansion caused the failure and now its gone too far..
     
  20. noonboots

    noonboots Senior Member

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    Apply a 12v live to the small terminal on the starter solenoid. The solenoid should click in and the starter should turn the engine. If it doesn't the starter is u/s. If it does then there is a problem with the wiring, possibly being affected by heat.
     

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